Spin-dipole-induced lifetime of the least-bound 5Σ+g state of He(23S1)+He(23S1)

Beams, Timothy J., Peach, Gillian, and Whittingham, Ian B. (2006) Spin-dipole-induced lifetime of the least-bound 5Σ+g state of He(23S1)+He(23S1). Physical Review A (Atomic, Molecular and Optical Physics), 74 (1). 014702-1.

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The properties of the least-bound vibrational level (v=14) of the Σg+5 state formed during the ultracold collision of two spin-polarized metastable 2S13 helium atoms are crucial to studies of photoassociation spectroscopy of metastable helium. We report a calculation of the autoionization lifetime τg of this state induced by spin-dipole coupling of the Σg+5 state to the Σg+1 state from which Penning and associative ionization processes are highly probable. We find τg≈150μs , significantly larger than the recent experimental estimates of (0.5‑3)μs.

Item ID: 4655
Item Type: Article (Research - C1)
ISSN: 1050-2947
Keywords: atomic scattering; ultracold atomic collisions; helium neutral atoms; autoionisation; vibrational states; metastable states; Penning ionisation; associative ionisation; atom-photon collisions; radiative lifetimes; bound states
Date Deposited: 17 Jun 2009 22:58
FoR Codes: 02 PHYSICAL SCIENCES > 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics > 020201 Atomic and Molecular Physics @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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